Announcing new file template management for document library content types

Hey everyone,

setting something up like this (see below) sounds pretty straightforward ... but I haven't figured out how to do it with the new Sharepoint document library. Basically, I just want to:

• add several company templates (potx, dotx, ...) 
• make sure people find them (on a modern page > by adding the 'document library' functionality)
• user clicks a file so it opens in Powerpoint, Word, Excel (as a new document)
• make sure they don't save their creation in this document library with the company templates

More or less the most basic form of template management ;-). But:

• I can upload template files into a new modern library
• but I can't 'see them' when i integrate the document library web part
• if I click the standard Powerpoint-template ... my file saves itself inside the document library.

Has anyone found out how to do this? So basically: make a nice page with company templates in a visual way (present them as tiles or so) > people click > program opens > make something > store somewhere. 

Thanks for helping out! And sorry if it's a stupid question.